Two moderate tremors rattled northern and central parts of California, but neither produced significant damage or any injuries.

The San Francisco Bay Area was jolted by a magnitude 3.7 quake Wednesday evening, centered 2 miles (3 km) east of Berkeley at a depth of 6 miles (10 km). It occurred at 7:12 p.m. local time and sounded like a "freight train" to those near the epicenter.

Seismologists said the tremor occurred on the Hayward fault zone, which runs north-south through eastern parts of the Bay Area.

• A cluster of tremors gently rattled the central California town of Coalinga within a 24-hour period, leaving residents jittery but causing no injuries or property damage.

The most powerful struck at 10:14 p.m. on Dec. 15 and registered a magnitude of 4.3 about 4 miles (6 km) east of the Fresno county farming community. It was followed by about a dozen smaller quakes during the next several hours.

All of the seismic slips originated in the same general location, at a depth of about 6 miles (10 km).

Coalinga was wrecked by a magnitude 6.5 temblor on May 2, 1983, that destroyed more than 800 homes and other buildings.